Abstract

A fiber-optic intensity sensor has been developed for vertically
positioning microelectrode arrays above the retina of a live
frog. Closely spaced fibers illuminate and collect reflections from
the retinal surface, and the output is electronically processed to
drive an automated positioning circuit. Experimental and
theoretical evaluations of fiber types and separation for both specular
and diffuse reflectors, in vitro and in vivo, are
presented, and multimode fibers on 125-μm centers are chosen
for retinal experimentation. The sensor has applications in
assessing spatial selectivity of stimulation of a multielectrode array
and may be adaptable for lateral positioning.

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